CN202210680U - Dynamic power flow control device of controllable transformer with wave trap - Google Patents

Dynamic power flow control device of controllable transformer with wave trap Download PDF

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CN202210680U
CN202210680U CN2011203411233U CN201120341123U CN202210680U CN 202210680 U CN202210680 U CN 202210680U CN 2011203411233 U CN2011203411233 U CN 2011203411233U CN 201120341123 U CN201120341123 U CN 201120341123U CN 202210680 U CN202210680 U CN 202210680U
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transformer
power
controllable transformer
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control module
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李国杰
江秀臣
盛戈皞
冯琳
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Shanghai Jiaotong University
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    • Y02E40/30—Reactive power compensation
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Abstract

A dynamic power flow control device of a controllable transformer with a wave trap comprises the controllable transformer, a power unit, a measurement and control module, a bypass switch, the wave trap, an input voltage mutual inductor, an output voltage mutual inductor and an output current mutual inductor, the control method of the dynamic power flow is to utilize a power electronic switch which is rapidly conducted and shut down to control the conduction and the shutoff of a tap joint at the output side (secondary side) of the controllable transformer, a direct current signal is adopted to inject a frequency doubling (or frequency multiplication) signal into a pulse width modulation signal, the phase and the amplitude of the output voltage of the controllable transformer are changed by changing the amplitude of the direct current signal and the amplitude and the initial phase of the frequency doubling (or frequency multiplication) signal, the regulation of active power and reactive power is realized, 3-order harmonic (or odd harmonic corresponding to the frequency multiplication) of the output voltage of a dynamic power flow controller of the controllable transformer is filtered by the wave trap, the output voltage has no distortion, and the method has the characteristics of low cost and high control reliability of dynamic tide.

Description

The dynamic power flow control device of the controllable transformer of band trapper
Technical field
The utility model relates to the flexible transmission technical field, particularly a kind of dynamic power flow control device of the controllable transformer with trapper.
Background technology
Along with the use of the interconnected and various new equipments of large-scale power system, make generating, transmission of electricity more economical, also increased the scale and the complexity of electric power system simultaneously efficiently, operation of power networks also greatly increases in the possibility at stability limit edge.Therefore, the flexibility of operation of power networks, trend controllability and grid stability become the problem that more and more presses for solution.
Therefore, the demand that produced of the transmission system operating pressure of 21 century may be summarized to be following 3 aspects:
(1) increase ability to transmit electricity: thus because the increase of electricity consumption makes the transmission of electric energy demand increase, the situation of line construction reduction makes the requirement that improves ability to transmit electricity more outstanding on the other hand.
(2) keep system stability: serious power system accident causes severe impairment can for the social life in the vast service area; Like interruption of communication, cut off the water and electricity supply, communication paralysis, financial circulation are damaged, the precise machining process process is impaired, computerized information is lost etc., directly influences user's normal electricity consumption.Therefore, how in the compelled more electric power of longer distances of electric power system, still can keep the stability of a system, just become another vital task of management and running personnel.
(3) optimize the system operation: the change frequency that changes the power delivery that is determined with electricity market because of service conditions increases fast, and system controls and becomes more complicated, need the trend of total system be optimized.This optimization need be taken all factors into consideration the situation of overall situation operation in increasing area.In addition; Electricity market requirement system through specific " a contract path " go to control flow of power to; Control has the higher ability of controlling to trend to require electrical network; And this is difficult to accomplish in AC transmission system, because wherein the electric power in each " path " all is by the decision of the electrical characteristic of other all power transmission lines.
Flexible AC transmitting system (the Flexible Alternate Current Transmission System that arises at the historic moment to the demand; FACTS) technology, fundamentally changed ac grid system basically only rely in the past mechanical type, at a slow speed, be interrupted and the situation of coarse control and optimisation technique measure.The FACTS device is voltage, impedance and the phase angle on the control transmission line simultaneously or selectively, realize meritorious and reactive power flow control, for ac grid system provides rapidly, continuously and accurate control and the ability of optimizing trend.Under the prerequisite that does not change system's power generation mode and network topology structure, can utilize the FACTS device to improve the stability of system, improve the ability to transmit electricity of system, and alleviate the clogged conditions of system to a certain extent.
Though present FACTS technology has above many advantages,, also have significant limitation: FACTS unit engineering cost is high, applies difficulty; There is ill-effect between FACTS and power equipment and other controllers; The loss of FACTS device self is big; The complicated control structure of FACTS device and to the requirement of corresponding auxiliary devices such as communications facility has proposed more strict requirement to the operation and the control of electrical network; The additional problem that plant failure is brought; Stability of a system problem that the series connection access causes or the like makes its application in electrical network receive very big restriction.
Summary of the invention
To the problems referred to above; The purpose of the utility model provides a kind of dynamic power flow control device and control method thereof of the controllable transformer with trapper; Pass through trapper; The low-order harmonic of filtering controllable transformer output improves trend adjusting, ability to transmit electricity, the stability of a system, the reliability of electric power system.
The technical solution of the utility model is following:
A kind of dynamic power flow control device of the controllable transformer with trapper, its characteristics are that the formation of this dynamic power flow control device comprises controllable transformer, power cell, measurement and control module, trapper, by-pass switch, input voltage instrument transformer, output voltage instrument transformer and output current transformer:
The secondary of described controllable transformer comprises major joint and plus tapping head minus tapping head;
Described power cell is connected between plus tapping head, minus tapping head and the out-put supply or the load of controllable transformer secondary; This power cell is made up of first group power, second group power, filter inductance and filter capacitor; Described first group power and second group power constitute by 2 insulated gate bipolar transistors (abbreviating IGBT as) differential concatenation; One end of described first group power and second group power connects the plus tapping head and the minus tapping head of described controllable transformer secondary respectively; One end of the described filter inductance of another termination of described first group power and second group power; The input of the said trapper of another termination of this filter inductance; The described out-put supply of output termination or the load of this trapper, described filter capacitor are connected between the plus tapping head and minus tapping head of described controllable transformer secondary, and the control end of described first group power and second group power links to each other with the corresponding controling end of control module with described measurement;
Described trapper is made up of passive reactor and capacitor;
Described by-pass switch is connected between the major joint and out-put supply or load of described controllable transformer secondary;
One side of described input voltage instrument transformer links to each other with the former limit of controllable transformer input voltage main circuit, and voltage signal output end links to each other with the voltage signal input port of control module with described measurement;
One side of described output voltage instrument transformer links to each other with controllable transformer secondary output voltage main circuit, and output links to each other with the voltage signal input port of control module with described measurement;
Described output current transformer is serially connected in the output main circuit of controllable transformer, and its current signal output end links to each other with the current signal input port of control module with described measurement;
Described measurement links to each other with described first group power and the control end of second group power and the control end of described by-pass switch of described power cell respectively with the control signal output ends of control module, and this measurement links to each other with host computer with control module.
Described measurement and control module are digital signal processor, single-chip microcomputer or computer.
A kind of dynamic power flow control device that utilizes described controllable transformer based on the outlet side switch carries out the control method of dynamic power flow, and it is following concrete rapid that its characteristics are that this method comprises:
1) described measurement and control module are carried out initialization to measuring with control, send signal to by-pass switch and turn-off by-pass switch, receive the set-point Q of the given reactive power of host computer 0Set-point P with active power 0
2) described measurement and control module receive the input voltage V that described input voltage instrument transformer, described output voltage instrument transformer and described output current transformer are imported respectively In, output voltage V Out, output current I, output voltage and output current angle β, receive distant place line voltage V Electrical network 2Information and transmission line reactance value L:
V Electrical network 2=V 2Sin (ω 0T+ α), V wherein 2Be its amplitude, α is its phase angle;
Calculate active power P, the reactive power Q of actual measurement by following formula:
P = 1 2 V out I cos β
Q = 1 2 V out I sin β ;
3) according to active power P 0And reactive power Q 0,, calculate the output voltage phase angle theta and the output voltage amplitude V of controllable transformer according to following formula Out:
P 0 = V 2 V out ω 0 L sin ( α - θ )
Q 0 = V 2 2 - V 2 V out cos ( α - θ ) ω 0 L ,
Wherein: L is the reactance value of transmission line;
ω 0Be 50 or the pairing angular frequency of 60Hz;
V 2Be distant place line voltage V Electrical network 2Amplitude;
4) calculate pulse width modulation duty D:
1., according to controllable transformer input voltage V In, output voltage phase angle theta and amplitude V Out, by the direct current signal COEFFICIENT K in the pulse-width signal of following formula calculating insulated gate bipolar transistor 0, two frequency-doubled signal COEFFICIENT K 2And initial phase
Figure BDA0000090694280000035
Figure BDA0000090694280000042
Wherein: V 1Be controllable transformer input voltage V InAmplitude, N is a controllable transformer tap no-load voltage ratio;
2., according to the direct current signal COEFFICIENT K 0, two frequency-doubled signal COEFFICIENT K 2And initial phase
Figure BDA0000090694280000043
According to following formula, calculate pulse width modulation duty D:
5) according to pulse width modulation duty D, to the conducting of insulated gate bipolar transistor pulse-width signal control insulated gate bipolar transistor;
6) repeating step 2) to 5), according to the pulse width modulation duty D that is obtained, the adjusting of the dynamic power flow of electrical network is controlled through the conducting realization of control insulated gate bipolar transistor.
When above-mentioned power cell was worked, by-pass switch turn-offed, when above-mentioned power tube is deactivated, and the by-pass switch conducting.
The dynamic power flow control of the controllable transformer of the band trapper that the utility model proposes be a kind of according to the electrical network demand to the active power of controllable transformer place transmission line and the device that reactive power is controlled, and the output voltage of no harmonic wave is provided.Conducting and shutoff through IGBT control controllable transformer secondary tap; In the pulse-width signal direct current signal of IGBT, inject two frequency-doubled signals; Through changing direct current signal amplitude and the amplitude and the initial phase of two frequency-doubled signals in the pulse-width signal, thereby phase place, the amplitude of controllable transformer output voltage, 3 subharmonic that produced have been changed; Content is about 7.3%, by the trapper filtering.The low-order harmonic that trapper filtering power cell produces, to the modulation signal of being made up of direct current signal and input power supply first-harmonic two frequency-doubled signals, filtering is by 3 subharmonic that it produced; For the multiple frequence modulation signal, can corresponding filtering 5 times or other odd harmonic.
The characteristics of the utility model are following:
1. power tube only needs the conducting of controllable transformer tap is controlled, thereby cost is low, has overcome the expensive problem of existing FACTS device;
2. usual controllable transformer can only be through regulating the control that its tap carries out voltage magnitude, and the utility model is through injecting two frequency-doubled signals to power tube IGBT pulse-width signal, thereby realized the skew of input voltage angle, realized the control of active power;
3. through trapper, make the voltage of transformer output with level and smooth, filtering 3 subharmonic;
4. for the multiple frequence modulation signal, trapper can corresponding filtering 5 times or other odd harmonic.
Description of drawings
Fig. 1 is the structural representation of dynamic power flow control device of the controllable transformer of the utility model band trapper.
Fig. 2 is the input and output voltage analogous diagram of dynamic power flow control device that does not have the controllable transformer of trapper.
Fig. 3 is the harmonic wave of output voltage analysis chart of dynamic power flow control device that does not have the controllable transformer of trapper.
Fig. 4 is the input and output voltage analogous diagram of dynamic power flow control device of the controllable transformer of the utility model band trapper.
Fig. 5 is the harmonic wave of output voltage analysis chart of dynamic power flow control device of the controllable transformer of the utility model band trapper.
Embodiment
Below in conjunction with embodiment and accompanying drawing the utility model is described further, but should limit the protection range of the utility model with this.
See also Fig. 1 earlier, Fig. 1 is the structural representation of dynamic power flow control device of the controllable transformer of the utility model band trapper.Visible by figure; A kind of dynamic power flow control device of the controllable transformer with trapper comprises: controllable transformer 1, power cell 2, measurement and control module 3, by-pass switch 4, trapper 8, input voltage instrument transformer 5, output voltage instrument transformer 6 and output current transformer 7 constitute:
The secondary of described controllable transformer 1 comprises major joint 12 and plus tapping head 13 minus tapping heads 11;
Described power cell 2 is by the first group power S 1, the second group power S 2, filter inductance L fWith filter capacitor C fForm this power cell 2 described first group power S 1With the second group power S 2Constitute the described first group power S by 2 insulated gate bipolar transistor differential concatenations 1With the second group power S 2An end connect the plus tapping head 13 and minus tapping head 11 of described controllable transformer 1 secondary, the described first group power S respectively 1With the second group power S 2The described filter inductance L of another termination fAn end, this filter inductance L fDescribed trapper 8 inputs of another termination, the described out-put supply of output termination or the load of this trapper 8, described filter capacitor C fBe connected between the plus tapping head 13 and minus tapping head 11 of described controllable transformer 1 secondary the described first group power S 1With the second group power S 2Control end link to each other with the corresponding controling end of described measurement with control module 3;
Described trapper 8 is made up of passive reactor and capacitor;
Described by-pass switch 4 is connected between the major joint 12 and out-put supply or load of described controllable transformer 1 secondary;
One side of described input voltage instrument transformer 5 links to each other with the former limit of controllable transformer input voltage main circuit, and voltage signal output end links to each other with the voltage signal input port of control module 3 with described measurement;
Described output voltage instrument transformer 6, one sides link to each other with controllable transformer secondary output voltage main circuit, and output links to each other with the voltage signal input port of control module 3 with described measurement;
Described output current transformer 7 is serially connected in the output main circuit of controllable transformer, and its current signal output end links to each other with the current signal input port of control module 3 with described measurement;
The control signal output ends of described measurement and control module 3 respectively with the described first group power S of described power cell 1With the second group power S 2The control end of control end and described by-pass switch 4 link to each other, this measurement links to each other with host computer with control module 3.
Described measurement and control module 3 are digital signal processor, single-chip microcomputer or computer.
A kind of dynamic power flow control device of the controllable transformer of band trapper that utilizes carries out electrical network dynamic power flow control method, comprises following concrete steps:
1) initialization is carried out in 3 pairs of measurements of described measurement and control module and control, sends signal to by-pass switch 4 and turn-offs by-pass switch, receives the set-point Q of the given reactive power of host computer 0Set-point P with active power 0
2) described measurement and control module 3 receives the input voltage V that described input voltage instrument transformer 5, described output voltage instrument transformer 6 and described output current transformer 7 are imported respectively In, output voltage V Out, output current I, output voltage and output current angle β, receive distant place line voltage V Electrical network 2Information and transmission line reactance value L:
V Electrical network 2=V 2Sin (ω 0T+ α), V wherein 2Be its amplitude, α is its phase angle;
Calculate active power P, the reactive power Q of actual measurement by following formula:
P = 1 2 V out I cos β
Q = 1 2 V out I sin β ;
3) according to active power P 0And reactive power Q 0,, calculate the output voltage phase angle theta and the output voltage amplitude V of controllable transformer according to following formula Out:
P 0 = V 2 V out ω 0 L sin ( α - θ )
Q 0 = V 2 2 - V 2 V out cos ( α - θ ) ω 0 L ,
Wherein: L is the reactance value of transmission line;
ω 0Be 50 or the pairing angular frequency of 60Hz;
V 2Be distant place line voltage V Electrical network 2Amplitude;
4) calculate pulse width modulation duty D:
1., according to controllable transformer input voltage V In, output voltage phase angle theta and amplitude V Out, by the direct current signal COEFFICIENT K in the pulse-width signal of following formula calculating insulated gate bipolar transistor 0, two frequency-doubled signal COEFFICIENT K 2And initial phase
Figure BDA0000090694280000065
Figure BDA0000090694280000066
Figure BDA0000090694280000071
Wherein: V 1Be controllable transformer input voltage V InAmplitude, N is a controllable transformer tap no-load voltage ratio;
2., according to the direct current signal COEFFICIENT K 0, two frequency-doubled signal COEFFICIENT K 2And initial phase
Figure BDA0000090694280000072
According to following formula, calculate pulse width modulation duty D:
5) according to pulse width modulation duty D, to the conducting of insulated gate bipolar transistor pulse-width signal control insulated gate bipolar transistor;
6) repeating step 2) to 5), according to the pulse width modulation duty D that is obtained, the adjusting of the dynamic power flow of electrical network is controlled through the conducting realization of control insulated gate bipolar transistor.
Fig. 2 is N=0.15, K 0=K 2=0.5,
Figure BDA0000090694280000074
The time not with the input and output voltage simulation waveform of the dynamic power flow control device of the controllable transformer of trapper, can know that from output voltage waveforms it contains 3 subharmonic, though not high, also reach about 7.3%, harmonic wave of output voltage is analyzed as shown in Figure 3.Through behind the trapper, contained 3 subharmonic of former output are by filtering, and waveform is smooth, and is as shown in Figure 4, and in addition, the phase shift of controllable transformer output waveform is also high-visible; Fig. 5 is the harmonic wave of output voltage analysis chart of dynamic power flow control device of the controllable transformer of the utility model band trapper, shows among the figure that 3 subharmonic are effectively suppressed.

Claims (2)

1. dynamic power flow control device with the controllable transformer of trapper is characterized in that this device comprises that controllable transformer (1), power cell (2), measurement and control module (3), trapper (8), by-pass switch (4), input voltage instrument transformer (5), output voltage instrument transformer (6) and output current transformer (7) constitute:
The secondary of described controllable transformer (1) comprises major joint (12) and plus tapping head (13) minus tapping head (11);
Described power cell (2) is by the first group power (S 1), the second group power (S 2), filter inductance (L f) and filter capacitor (C f) form the described first group power (S of this power cell (2) 1) and the second group power (S 2) constitute the described first group power (S by 2 insulated gate bipolar transistor differential concatenations 1) and the second group power (S 2) an end connect the plus tapping head (13) and the minus tapping head 11 of described controllable transformer (1) secondary respectively), the described first group power (S 1) and the second group power (S 2) the described filter inductance (L of another termination f) an end, this filter inductance (L f) the input of another termination trapper (8), the described out-put supply of output termination or the load of this trapper (8), described filter capacitor (C f) be connected between the plus tapping head (13) and minus tapping head (11) of described controllable transformer (1) secondary the described first group power (S 1) and the second group power (S 2) control end link to each other with the corresponding controling end of described measurement with control module (3);
Described trapper (8) is made up of passive reactor and capacitor;
Described by-pass switch (4) is connected between the major joint (12) and out-put supply or load of described controllable transformer (1) secondary;
One side of described input voltage instrument transformer (5) links to each other with the former limit of controllable transformer input voltage main circuit, and voltage signal output end links to each other with the voltage signal input port of described measurement with control module (3);
Described output voltage instrument transformer (6), a side links to each other with controllable transformer secondary output voltage main circuit, and voltage signal output end links to each other with the voltage signal input port of described measurement with control module (3);
Described output current transformer (7) is serially connected in the output main circuit of controllable transformer, and its current signal output end links to each other with the current signal input port of described measurement with control module (3);
The control signal output ends of described measurement and control module (3) respectively with the described first group power (S of described power cell 1) and the second group power (S 2) the control end of control end and described by-pass switch (4) link to each other, this measurement links to each other with host computer with control module (3).
2. the dynamic power flow control device of the controllable transformer of band trapper according to claim 1 is characterized in that described measurement and control module (3) are digital signal processor, single-chip microcomputer or computer.
CN2011203411233U 2011-09-13 2011-09-13 Dynamic power flow control device of controllable transformer with wave trap Expired - Lifetime CN202210680U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102306935A (en) * 2011-09-13 2012-01-04 上海交通大学 Dynamic power flow control device with wave trap and control method for controllable transformer
CN109359822A (en) * 2018-09-21 2019-02-19 国网江苏省电力有限公司电力科学研究院 Electronic type voltage transformer measuring state appraisal procedure and system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102306935A (en) * 2011-09-13 2012-01-04 上海交通大学 Dynamic power flow control device with wave trap and control method for controllable transformer
CN102306935B (en) * 2011-09-13 2013-08-07 上海交通大学 Dynamic power flow control device with wave trap for controllable transformer
CN109359822A (en) * 2018-09-21 2019-02-19 国网江苏省电力有限公司电力科学研究院 Electronic type voltage transformer measuring state appraisal procedure and system

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